Telephone call-bell



(No Model.)

TELEPHONE CALL BELL. I No. 280,451. Patented July 3, 1883. 121 .1. 1 55.2.

WITNESSES:

N, PETERS. Phclo-Ulhngrzlpher, Washington. D. c.

. llNrrEn STATES PATENT Grinch.

HENRY CLAY, OF PHILADELPHIA, PENNSYLVANIA.

TELEPHONE CALL-BELL.

SPECIFICATION forming part of Letters Patent No. 280,451, dated July 3, 1883. Application filed September 21, 1882. (No model.)

\ To all whom it may concern.-

Be it known that I, HENRY CLAY, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Telephone Call-Bells, which improvement is fully set forth in the following specification and accompanying drawings, in which Figure 1 is a view of the interior of the box containing the improvementin telephone callbells embodying my invention. Fig. 2 is a vertical section thereof. Fig. 3 is a view of a detached portion. Fig. 4 is a detached view of the hook, &c., hereinafter described, and proximate devices.

Similar letters of reference indicate corresponding parts'in the several figures.

My invention consists of certain improvements in telephone call-bells, the construction, operation, and advantages whereof 'will be hereinafter fully set forth. I

Referring to the drawings, A represents the box of a telephone call-bell, in which is also contained the transmitter.

B represents the hook on which the telephonic ear-piece is hung, the same having an' insulated axis, a, which is supported on the frame 0 within the box A. The end of the hook B within the box is formed with an inwardly projecting nose, 1), and an outwardly-project ing hook, c, with either of which is adapted to engage an insulated pin or stud, D, project ing laterally from a spur-wheel, E, which is mounted on a shaft, F, and meshes with a wheel, G, the shaft H whereof carries a spurwheel, J, which meshes with a pinion, K, whose shaft L has fixed to it the rotary armature M of the magnet N, the several shafts named being sustained on the frame 0. The shaft F also carries a ratchet-wheel, P, and a coiled spring, Q, both rigidly secured to said shaft, and engaging with said ratchet-wheel is a pawl, R, which is hung on the arm or lever of the bell-hammer to be hereinafter referred to.

Adjacent to the pawl R is pivoted an elbowlever, S, the upper or outer limb of which projects under the pawl R, or is otherwise c011- nected therewith.

To the wheel E, at a right angle to the axis thereof, is pivoted a dog, T, one end of which is attached to the outer end of the coiled spring Q, and the other end is adapted to engage with the lower or inner limb of the elbow-lever S.

V represents magnets between which vibrates the arm or lever \V of the bell-hammer X, the bell or bells Y being properly supported on the box A.

Z represents a spring for returning the hook B to its normal position, the same being properly secured to said hook and the frame 0, and Z represents a pawl mounted on the frame 0, and engaging with the ratchetwheel P for preventing improper rotation thereof. Suitable wires, (1 (2, run from the armature M and magnet N, and wires f grun from the hook B and magnetsV to hooks A, which are secured to the rear of the box A.

A represents the back board, which, at tached to the wall or elsewhere, is adapted to sustain the box A and the parts thereof, said board having plates A', with which the wires h, leading from the instrument to the place of service, are connected, said plates being so disposed that when the box is hung in position the hooks A and the'plates A are in contact and in electric connection.

The operation is as follows: As shown in the drawings, the ear-piece has been removed from the hook B, the spring Z having raised said hook, by which action the pin or stud D is clear of the hook c and engaged by the nose I). The passage of the pin fromsaid hook to the nose 1) sets the train of wheels in motion and rotates the armature M, the latter creating an electric current which rings the callbell of the instrument desired for communication. After service the ear-piece is replaced on the hook B, and the weight of this piece draws the hook downward, and thus releases the pin or stud D from the nose 1). Owing to the spring Q, which has been properly adjusted previously, the wheel E now revolves until .the pin or stud D is arrested by the hook c, the latter having been placed in the path of .the pin or stud D by the downward motion of the hook B. By the revolution of the wheel the train of wheel-work is put in motion, and the current generated passes through the magnets V, causing the armature W to vibrate and the bell-hammer X to strike the bells Y, and auto matically disconnecting the wires at the central ofiice. This disconnection is effected by the action of the electric current upon an automatic combination of devices described in my separate application for patent on a telephonic switchboard. The vibration of the armature \V operates the pawl B, which in turn winds the ratchetavheel 1. it being held or locked by the catch-pawl Z. Since the ratchet wheel l and spring (Q, are secured to the same shaft, it is evident that the spring Q will bewound up. To prevent its being too tightly wound, I attach to the end of the spring opposite to that secured to the shaft F one end of the dog T, while the other end rests against the lower end of the elbow-lever S, as has been stated. This end is so constructed as to encircle the shaft F, thus permitting the lower end of the dogT to be in constant contact with the elbowlever S. The end of the elbow-lever S opposite to the end encircling the shaft F passes under the pawl R. Should the spring Q now be wound too tightly, it will draw one end of the dog T toward the shaft F, thus forcing the elbow-lever to raise the pawl R clear of the ratchet-wheel l, as may be distinctly seen in Fig. 2. This having been done, it is evident that the bell may continue to be rung by the current without being retarded by the too close winding of the spring Q. The electric current enters the box through one of the wires l1 and leaves it by the other. These wires are respectively attached to hooks A one on each side of the box. \Vire g connects one of said hooks to magnet V, and a wire, d, connects said magnet to the revolving armature M of the generator. The electrical current, following the line of conductors thus far described, passes to and through permanent magnet N, and thence through wire 0 to acontact-point or electrode, 0. YVhen the telephoneis hung on the hook, this electrode is in contact with hook B, which is connected electrically with the other hook, i thus complet ing the circuit, excepting the necessary ex.- ternal connections between the two wires 71 7:, which need not be here described. The circuit in practice will sometimes be reversed, as it is equally operative, whichever may be the direction of the current. 'When thetelephone is not on the hook 5, the latter is drawn up by spring Z, shown, and the circuit is broken between it and electrode 0. The current cannot pass through the mechanism of the call-bell under such circumstances, but will pass down wire f to the said hook, and

thence directly away from said mechanism 1 through electrical connections which need not here be described.

As described, that portion of the instrument relating to the stud or pin II) and nose and hook I) c is for exchange-lines giving a short alarm for on and long ring for off. In using the instrument for private purposes, where the alarms are just the reverse, I place the extension of the hook B underneath the shaft F instead of overhanging the same, and allow the stud or pin 1) to be at rest on the lower side. It is evident that thus I get the long ring upon removing the ear-piece and the short one upon replacing it. The current generated by the mechanism in one bell or signaling-instrunient is not sufficient to wind its motor. The spring Q is wound by the action of the armature-lever \V and the intervening devices, said lever being caused to vibrate by the magnets V .as their polarity is changed by the current created by the generator of the central oflice or distant station. At the same time this current rings the bells .Y by the strokes of hammer X, carried by said armature-lever. During this operation the mechanismin caseA' isi'notionless, except said armature-lever, pawl R, carried thereljiy, wheel 1, and arbor F, to which the inner end of the spring Q, is attached. \Vhen' the mechanism referred to within case A is in operation, it partly winds its own spring Q, and also winds the correspoinling spring of a distant instrument, as before stated, and of as many instruments as are in circuit. These devices are used in connection with a strong generator at the central oiiice, the main dependence being on the currents created thereby.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a telephonic call-bell, the hook 13, formed with a nose, I, and hook c, in combination with the spur whcel E, having a pin or stud, l), gearing G .T K, the rotary armature M, and magnet l substantially as and for the purpose set forth.

2. The hook B, in combination with the ratchet-wheel P, pawl 1%, arm or lever XV of the bell-hammer, bell or bells Y, and magnets V, substantially as and for the purpose set forth.

3. The pawl R on the bell-hammer arm or lever, inv combination with the elbow-lever S, dog T, coiled spring Q, the spur-wheel E, having a stud, l), and the shaft F, substantially as and for the purpose set forth.

HENRY CLAY.

Witnesses:

JOHN A. \Vinnnnsnnm, \V. F. Kmcnnn. 

